Advanced search
Start date

Compatibilization and degradation of PLA composites reinforced with sisal fibers

Grant number: 17/18678-4
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): March 01, 2018
Effective date (End): December 31, 2018
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Silvia Helena Prado Bettini
Grantee:Julia Florez Ablan
Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil


The PLA is an eco-friendly polymer known for its good mechanical performance. Therefore, it is an excellent candidate for the replacement of polluting commodity polymers. The high price of PLA prevents it from occupying a more important role in the market. This issue can be solved reinforcing the PLA with natural fibers that increase their mechanical properties and reduce its cost, making it a more competitive product. Compatibilizers are used in order to obtain a good interfacial cohesion between the polymer and the fiber. Nevertheless, previous studies have shown that these compatibilizers can degrade the polymeric matrix. As a result, in spite of the good matrix-fiber cohesion the mechanical properties can be strongly compromised. Additives can be used to reduce the degradation; however, they can prejudice the interfacial cohesion. For this reason, this project intends to evaluate the effect of a compatibilizer, PLA grafted with maleic anhydride (PLA-g-MA), and an additive, containing carbodiimide groups, in the mechanical properties of PLA composites with 30% of sisal as the reinforcing fibers. In this sense, it will be made a 22 factorial experiment where the two factors will be the PLA-g-MA concentration and the additive concentration, maintaining constant the sisal proportion. A double screw extruder will process the PLA. Tensile tests will be made for the evaluation of the mechanical properties. Size-Exclusion Chromatography (SEC) analyses will be able to determine the molar mass of the polymeric matrix. Scanning Electron Microscope (SEM) fracture surface images will allow the evaluation of the matrix-fibers interfacial cohesion and finally, Differential Scanning Calorimetry (DSC) analyses will help in the thermal characterization and the degree of crystallinity of the samples. (AU)

News published in Agência FAPESP Newsletter about the scholarship:
Articles published in other media outlets (0 total):
More itemsLess items

Please report errors in scientific publications list using this form.